<!doctype html> 
<html> 
<head> 
    <meta charset="utf-8"> 
    <title></title> 
    <script type="text/javascript" src='jquery-1.9.1.min.js'></script>
</head>
<body>
<script type="text/javascript">
	$('body').css({
		'width':300,
		'height':200
	});
	$.extend({
		'sunmin':function(){
			alert(1);
		},
		'ssss':function(){
			return Math.random();
		},
		'bodyMax':function(){
			return {w:innerWidth,h:innerHeight}
		}
	});

	alert($.bodyMax().h);
</script>
</body>
</html>